docs: def _status_line(self, tense='past'):
          """
          Text indicating what has been / is being done.
  
          Doctest:
              >>> print(Timerit()._status_line(tense='past'))
              Timed for: 1 loops, best of 1
              >>> print(Timerit()._status_line(tense='present'))
              Timing for: 1 loops, best of 1
          """
          action = {'past': 'Timed',  'present': 'Timing'}[tense]
          line = '{action} {label}for: {num:d} loops, best of {bestof:d}'.format(
              label=self.label + ' ' if self.label else '',
              action=action, num=self.num, bestof=min(self.bestof, self.num))
          return line